Glacial Lake Agassiz went through many periods of catastrophic drainage starting at 13,000 years ago. Some of these periods of catastrophic change have been linked to periods of cooling climate,
particularly when the lake drained through the St. Lawrence Seaway and into the North Atlantic. How would the drainage of Lake Agassiz affect the climate to such a degree that cooling would result?
What will be an ideal response?
Answer: Lake Agassiz was a cold, proglacial lake, so when such large volumes of cool freshwater were jettisoned into the North Atlantic, they rested on top of the saltwater because of the freshwater's lower density. This process changed the turnover point near Iceland for the Thermohaline Circulation Current (THC). Instead of bringing warm water and warm air masses farther north, the THC was deflected farther to the south. The result was a colder climate.
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How does the Continental Arc System of mountain building, in which volcanic arc activity is apparent near a subduction zone, form?
a) An oceanic plate collides with an oceanic plate b) An oceanic plate collides with a continental plate c) A continental plate collides with a continental plate d) An area of divergence or spreading occurs
The practice of intentionally trying to eliminate a national, ethnic, racial or religious group is known as
A) genocide. B) subnationalism. C) ethnic cleansing. D) civil wars.
Which one of the following phenomena can lead to Paleontological Evidence for documenting global climate change?
a. Both the tree pollen and the grass pollen live in a similar climate belt b. The dominance of the tree pollen or the grass pollen found in sediment does not depend on climate c. Tree pollen dominates when the climate is cooler; while grass pollen dominates when it is warmer d. None of the above
The geologic time scale was originally developed using relative time principles and fossil correlation.
Answer the following statement true (T) or false (F)